William g



W. G. BLLL 85W. P. GLY,

l CLUTCH MLGLLLNISM.` N0.297,489. Patented Apr.l 22,1884.

(-N' Model.)

N. PETERS, Pnalvumognphnr, washington, Dy c.

@Ntra -rafrns ArtNr errer? I VILLTAM G. BELL AND WILLIAM l?. GAY, OF BOSTON, MASSACHUSETTS, ASSTGNORS TO SAID BELL.

CLUTCH MECHANISlVl.

SPECFICATION forming part of Letters Patent No. 297,489, dated April 22, 1884.

Application filed January 52, 18S-I.

The object of this invention is to improve friction-clutches for machines of all kinds by dispensing with external brackets and devices for connecting the shipping-lever with the sliding clutch, and employing instead a tubular shaft for the driving-pulley to turn on, and a longitudinally-moving rod through the axis thereof t'o actuate the clutch.

Our invention consists in the devices and combinations of devices set forth in the appended claims.

In the drawings, Figure l is a side view of a pulley provided with our improvements 5 and Fig. 2 is an elevation of the lever, shaft, and gearing,with the pulley and clutch in section.

Upon a suitable frame, A, provided with bearings B, a hollow shaft, C, is mounted for rotation. A pulley, D, turns freely on this shaft, except as it is engaged therewith by a suitable clutch. The drawings represent a well-known form of clutch, having a cross-bar, E, secured to the shaft and supporting two friction-segments, F, which are brought into contact with the rim of the pulley by toggles G, actuated by the longitudinal movement of a sliding-hub, H, and are freed from such contact by the reverse movement of the hub and the reaction of springs I.

The essential novelty of our apparatus is in the hollow shaft and the means of operating any suitable clutch through it. These means, as shown, include the actuatingrod K, provided with the pivoted lever L, or with a knob, screw, or other device, to move the rod longitudinally, and alsosome effective connection with the hubH, so that it can be reciprocated slightly upon the hollow shaft. XVe prefer to form this part of our mechanism as indicated The'hub has a cap, M, se-

in the drawings.

vin the hollow shaft.

(No model.)

cured to it, recessed to receive loosely a collar, N, formed on or attached to the outer end of the rod K, which it serves to hold centrally y XVe usually make this collar of composition metal, for better lubrication during rotation of the hub and its cap. The collar occupies an annular space between the hub and its cap, and hence imparts to them the reciprocating movement of the rod K, and permits them to revolve about it when by such movement the toggles have brought the segments F into frictional contact with the inner face of the pulley-rim. The reverse movement releases such contact, and places the parts in the positions shown in the drawings, where the pulley D may freely revolve without rotating any of the other parts.

7e are aware that various forms of clutch mechanism of a complicated nature have been heretofore devised, having on a hollow slotted shaft a fast pulley and a loose pulley, operated by a rotating rod working in said/shaft, with external threaded sleeves or other expensive attachments. Examples of such construction are shown in the patents of Sweett and lVoodman, May 5, 1874; Parkhurst, May l2, 1874, Manville, June 16, 1874, Starbuck, February 2, 1875, and Carver, March 9, 1875, which we disclaim. Our device requires but a single pulley of the plainest form.` The hollow shaft around which it revolves is a simple unslotted tube, and the clutchoperating rod passes loosely entirely through said tube, and does not revolve with it. Y

The simplicity, convenience, and self-contained character of our apparatus are obvious, and will be appreciated in practical use.

XVe claim as our inventionl. The tubular unslotted shaft C and the single belt-pulleyl), mounted loosely thereon, in combination with the clutch-operating rod K, extending entirely through said shaft, the lever L or other actuator at one end of said shaft, and clutch mechanism at the other end thereof, adapted by the reciprocation of said rod to be frictionally engagedwith said pulley and disengaged therefrom, substantially as set forth.

2. A belt-pulley of ordinary form loosely mounted on a plain tubular shaft, so as to re- IOO volve freely about the same Without imparteating rod K, and the collar N, engaging ining motion thereto, in combination with a ternally with the hub, substantially as and for cross-bar secured to said hollow shaft, and a the purpose set forth.

non-rotary rofl reciprocating` within it and en- In testimony whereof we hereto affix oursig- 15 5 gagingwith a hub which carries toggles adaptnatures in presence of two Witnesses.

ed to aotuate two friction-seaments at the eX- tremities of said cross-barisubstantially as and for the purpose set forth.

3. The hollow shaft C, the rotary pulley D, l

Io and the sliding` hub H, in combination with Vitnesses:

A. H. SPENCER,

the pivoted lever L, the non-rotary reoipro- E. A. PHELPs. 

